<template>
  <view>
    <view class="search-box">
     <!-- 基本用法 -->
     <uni-search-bar @input="input" :radius="100" cancelButton="none"></uni-search-bar>
    </view>
    
    <!-- 搜索建议列表 -->
    <view class="sugg-list" v-if="searchResults.length !== 0">
      <view class="sugg-item" v-for="(item,i) in searchResults" :key="i" @click="gotoDetail(item)">
        <view class="goods-name">{{item.goods_name}}</view>
        <uni-icons type="arrowright" size="16" ></uni-icons>         
        </view>
      </view>
      
      <!-- 搜索历史 -->
      <view class="history-box" v-else>
        <!-- 标题区域 -->
        <view class="history-title">
          <text>搜索历史</text>
          <uni-icons type="trash" size="17" @click="deleteClick"></uni-icons>
        </view>
        <!-- 列表区域 -->
        <view class="history-list">
          <uni-tag :text="item" v-for="(item,i) in histories" :key="i" @click="gotoGoodsList(item)"></uni-tag>
        </view>

      </view>
      
    </view>
    
  </view>
</template>

<script>
  export default {
    data() {
      return {
        timer: null,
        kw: '',
        //搜索的结果列表
        searchResults: [],
        //搜索历史的数组
        historyList: []
      };
    },
    onLoad(){
      JSON.parse(uni.getStorageSync('kw') || '[]')
    },
    
    methods:{
      //input输入参数
      input(e){
        // console.log(e)
        clearTimeout(this.timer)
        this.timer = setTimeout(()=>{
          // console.log(e)
          this.kw = e.value
          this.getSearchList()
        },500)
      },
      async getSearchList(){
        //判断搜索关键词是否为空
        if(this.kw.length === 0){
          this.searchResults = []
          return 
        }
        
        const {data: res} = await uni.$http.get('/api/public/v1/goods/qsearch',{ query: this.kw })
        if(res.meta.status !== 200 ) return uni.$showMsg()
        this.searchResults = res.message   
         
        this.saveSearchHistory()           
      },
      gotoDetail(item){
        // console.log(item.goods_id)
        uni.navigateTo({
          url: '/subpkg/goods_detail/goods_detail?goods_id=' + item.goods_id
        })
      },
      saveSearchHistory(){
        // this.historyList.push(this.kw)
        
        const set = new Set(this.historyList)
        set.delete(this.kw)
        set.add(this.kw)
        
        // console.log(set)
        
        this.historyList = Array.from(set)
        
        //对搜索历史数据，进行持久化的存储
        uni.setStorageSync('kw',JSON.stringify(this.historyList))

      },
      deleteClick(){
        this.historyList = []
        uni.setStorageSync('kw','[]')
      },
      gotoGoodsList(kw){
        uni.navigateTo({
          url: '/subpkg/goods_list/goods_list?query=' + kw
        })
      }
      
    },     
    
    computed:{
      histories(){
        return [...this.historyList].reverse()
      }
    }
  }
</script>

<style lang="scss">

  .search-box{
    position: sticky;
    top: 0;
    z-index: 999;
  }

  .sugg-list{
    //上下0 ;左右5
    padding: 0 5px;
    .sugg-item{
      display: flex;
      //纵向
      align-items: center;
      //横向
      justify-content: space-between;
      font-size: 12px;
      padding: 13px 0;
      border-bottom: 1px solid #efefef;
      .goods-name{
        //文字不允许换行
        white-space: nowrap;
        //溢出部分隐藏
        overflow: hidden;
        //文本溢出后,使用...代替
        text-overflow: ellipsis;
        margin-right: 3px;
      }
    }
  }
  
  .history-box{
    padding: 0 5px;
    .history-title{
      display: flex;
      justify-content: space-between;
      height: 40px;
      align-items: center;
      font-size: 13px;
      border-bottom: 1px solid #efefef;
      
    }
    .history-list{
      display: flex;
      flex-wrap: wrap;

    }
  }
  


</style>
